PHYSICS HIGH SCHOOL

Which of the following cannot be determined from the spectrum of a star?the chemicals in the atmosphere of the star
the motion of the star
the temperature of the atmosphere of the star
the chemicals in the core of the star

Answers

Answer 1
Answer:

Answer:

The chemicals in the core of the star

Explanation:

The spectrum of a star is of its atmosphere. The absorption or emission spectrum that is obtained indicates the chemical composition of the star's atmosphere. The peak wavelength obtained indicates the surface temperature of the star (using Wien's-Displacement Law). The shift in the spectrum indicates the motion of the star. If there is blueshift, it indicates that it is moving towards us where as if there is a red shift, it indicates that it is moving away from us.

Answer 2
Answer: The event that cannot be determined from the spectrum of a star is that the chemicals in the atmosphere of the star

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show how you would connect three resistors each of resistance 6 ohm so that the combination has a resistance of first 9 ohm second 4 ohm​

Answers

Answer:

show how you would connect three resistors each of resistance 6 ohm so that the combination has a resistance of first 9 ohm second 4 ohm

Explanation:

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The moon's mass is 7.35 × 1022 kg, and it moves around the earth approximately in a circle or radius 3.82 × 105 km. The time required for one revolution is 27.3 days. Calculate the centripetal force that must act on the moon. How does this compare to the gravitational force that the earth exerts on the moon at that same distance?

Answers

Explanation:

It is given that,

Mass of moon, m=7.35* 10^(22)\ kg

Radius of circle, r=3.82* 10^(5)\ km=3.82* 10^(8)\ m

The time required for one revolution is 27.3 days, t = 27.3 days

1 day = 86400 seconds

27.3 days = 2358720 seconds

Let v is the speed of moon around the circular path. It is given by :

v=(2\pi r)/(T)

v=(2\pi * 3.82* 10^(8)\ m)/(2358720\ s)

v = 1017.57 m/s

Let F is the centripetal force acting on the moon. It is given by :

F=(mv^2)/(r)

F=(7.35* 10^(22)\ kg* (1017.57\ m)^2)/(3.82* 10^(8)\ m)

F=1.99* 10^(20)\ m/s^2

So, the centripetal force that must act on the moon is 1.99* 10^(20)\ m/s^2. The gravitational force that the earth exerts on the moon at that same distance is also equal to 1.99* 10^(20)\ m/s^2. Hence, this is the required solution.

What causes the earths crust to move ?

Answers

Upwelling currents in the molten material beneath the crust.

The rocks that make up the crust are light, compared with the metal-rich material beneath. The crust floats on top like an iceberg. Slow-moving currents underneath propel the continents around the surface
The movement of magma underneath earth's crust.

What is the magnitude of force required to accelerate a car of mass 1.7 × 10³ kilograms by 4.75 meters/secondÆ?A. 3.6 X 10 ^3 N
B. 1.7X10^3 N
C. 8.1X10^3 N
D. 9.0X10^3 N

Answers

Answer:

Magnitude of force is F=8.1* 10^3\ N

Explanation:

It is given that,

Acceleration of car, a=4.75\ m\s^2

Mass of car, m=1.7* 10^3\ kg

We have to find magnitude of force. It is given by using Newton's second law of motion which states that force is given by the product of mass and acceleration :

F = m a

F=1.7* 10^3\ kg* 4.75\ m/s^2

F=8.075* 10^3\ N

or

F=8.1* 10^3\ N

Hence, the correct option is (c)

Best Answer:  8.075*10^3 NewtonsSource(s):Newton's Second Law of Motion P=MA

Fluid pressure ____________ as depth ____________.a. decreases, increases
c. increases, increases
b. decreases, decreases
d. both b and c are correct

Answers

c. The deeper you go below the fluid's surface the more matter is pressing downward on that point, so the greater the pressure.

The equation V=tk is used to describe the relationship between the volume of a gas tank and the time required to fill it . Is the symbol "K" a proportionally constant?

Answers

Answer:

The symbol 'K' is a proportionality constant because it shows the direct relationship between the gas tank volume, v, and the time required, t, to fill.

It  is also the constant product of the ratio of the gas tank volume to the time required to fill it.
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